Air pump



- May. 13, 1924.

. EIKELBERNER AIR PUMP Pril 20. 1923 I am Q l atentecl May 1924.

UNlTED srr rzs FRED S. EIKELBERNER, OF'LOG ANSPORT, INDIANA.

AIR PUMP.

Application filed April 20, 1923. Serial No. 633,460.

To all whom it may concern.

Be it known that I, FRED S. EIKELBERNER,

a citizen of the United States, residing at Logansport, in the county of Cass and State of Indiana, have invented certain new and useful Improvements in Air Pumps, of

which the following is a specification.

This invention relates to improvements in pumps and more particularly to a special construction for preventing the passage of fluid past the piston of the pump.

The primary object of the invention is to furnish novel means for expanding the cup leather washer of a pump piston and to maintain the cup leather in fully expandedposition.

Another object of the invention is to provide a resilient member designed to be applied to an ordinary pump piston and capable of maintaining the cup leather washer of said pump piston in expanded condition at all times, so that the fluid pumped cannot pass between said washer and the casing of the pump.

With the foregoing objects outlined and with other objects in view, which will appear as the description proceeds, the invention consists in the novel features hereinafter described in detail, illustrated in the accompanying drawing and more particularly pointed out in the appended claims.

Referring to the drawing:

Figure 1 is a side View of a pump partly broken away to illustrate the pistons.

Fig. 2 is a detail vertical sectional view of a portion of one of the pump pistons and the casing, and illustrating the improved means for maintaining the cup leather washer in expanded condition.

Fig. 3 is a bottom plan view of the construction shown in Fig. 2.

Fig. 4 is a detail view of the packing expanding member.

In the drawing, 1 designates a pump of any desired construction provided with piston rods 2 and 3 attached to pistons 1 and 5. Each of these pistons as best shown in Figures 2 and 3, consist of a small washer 6, a larger washer 7, a cup leather 8 and the improved expanding member 9. These elements are threaded on the lower end of the piston rod and the washer 6 abuts against lugs 10 arranged on the rod, while a nut 11 is employed to hold the parts in position.

The cup leather expanding member which really forms the essential feature of the present invention, consists of a circular disk 12 having a central aperture 13 to engage the piston rod and provided at its outer edge with downwardly extending lugs 14:. Each of these lugs preferably consists of a bended portion integral with the disk as shown in Fig. 2, and this bended portion forms a pocket to receive the inner end of a curved resilient arm 15. In the embodiment of the invention illustrated, there are three of these arms, and they all extend in an anticlockwise direction. When the disk 12 is placed on the piston rod, the arms 15 impinge against the inner surface of the cup washer 8, as shown in Figure 3, and owing to the inherent resiliency of said arms, each arm has a tendency to move outwardly away from the center of the disk, so that the skirt portion of the cup leather 8 will be constantly forced toward the inner surface 16 of the pump casing.

Prior to the present invention, constructions have been proposed for urging cup leather washers toward the pump casing, but all such constructions are more or less com plicated and expensive to manufacture, while the present construction is such that it may be struck from a single piece of sheet metal. Under such circumstances the lugs 14 will be integral with the disk 12 and the arms 13 will be integral with the lugs 141-.

Owing to the resiliency of the arms 15, the cup leather will be maintained in con tact with the inner surface of the casing, and no fluid will be permitted to pass between the cup leather and the casing. Consequently a pump provided with the improved expanding member, will be more powerful and efficient in action than one in which the fluid may pass by the cup leather.

From the foregoing, it is believed that the invention may be readily understood, and it is apparent that changes may be made in the details disclosed without departing from the spirit of the invention as expressed in the claims.

What is claimed and desired to be secured by Letters Patent is:

1. A packing expander comprising a disk,

a plurality of spaced lugs arranged on one side of said disk, and curved resilient arms connected to said lugs and arranged tangenllzialiy relatively to the periphery of said dis 2. In a pump, a piston provided With a cup leather washer, a disk arranged within said Washer and provided with lugs, and resilient curved arms having their inner ends fixed to said lugs and their outer ends 10 yieldingly engagin the inner surface of the skirt of the cup Washer.

In testimony whereof I aflix my signature.

FRED S. EIKELBERNER. 

